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428
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1 /* The event_stream interface for tty's.
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2 Copyright (C) 1994, 1995 Board of Trustees, University of Illinois.
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3 Copyright (C) 1995 Sun Microsystems, Inc.
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4 Copyright (C) 1995 Ben Wing.
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5
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6 This file is part of XEmacs.
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7
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8 XEmacs is free software; you can redistribute it and/or modify it
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9 under the terms of the GNU General Public License as published by the
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10 Free Software Foundation; either version 2, or (at your option) any
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11 later version.
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12
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13 XEmacs is distributed in the hope that it will be useful, but WITHOUT
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14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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16 for more details.
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17
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18 You should have received a copy of the GNU General Public License
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19 along with XEmacs; see the file COPYING. If not, write to
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20 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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21 Boston, MA 02111-1307, USA. */
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22
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23 /* Synched up with: Not in FSF. */
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24
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25 #include <config.h>
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26 #include "lisp.h"
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27
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28 #include "device.h"
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29 #include "console-tty.h"
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30 #include "events.h"
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31 #include "frame.h"
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32 #include "process.h"
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33
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34 #include "sysproc.h"
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35 #include "syswait.h"
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36 #include "systime.h"
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37
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38 /* Mask of bits indicating the descriptors that we wait for input on */
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39 extern SELECT_TYPE input_wait_mask, non_fake_input_wait_mask;
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40 extern SELECT_TYPE process_only_mask, tty_only_mask;
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41
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42 static struct event_stream *tty_event_stream;
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43
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44
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45 /************************************************************************/
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46 /* timeout events */
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47 /************************************************************************/
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48
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49 /* The pending timers are stored in an ordered list, where the first timer
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50 on the list is the first one to fire. Times recorded here are
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51 absolute. */
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52 static struct low_level_timeout *tty_timer_queue;
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53
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54 static int
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55 emacs_tty_add_timeout (EMACS_TIME thyme)
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56 {
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57 return add_low_level_timeout (&tty_timer_queue, thyme);
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58 }
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59
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60 static void
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61 emacs_tty_remove_timeout (int id)
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62 {
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63 remove_low_level_timeout (&tty_timer_queue, id);
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64 }
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65
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66 static void
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67 tty_timeout_to_emacs_event (struct Lisp_Event *emacs_event)
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68 {
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69 emacs_event->event_type = timeout_event;
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70 /* timeout events have nil as channel */
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71 emacs_event->timestamp = 0; /* #### */
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72 emacs_event->event.timeout.interval_id =
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73 pop_low_level_timeout (&tty_timer_queue, 0);
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74 emacs_event->event.timeout.function = Qnil;
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75 emacs_event->event.timeout.object = Qnil;
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76 }
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77
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78
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79
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80 static int
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81 emacs_tty_event_pending_p (int user_p)
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82 {
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83 if (!user_p)
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84 {
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85 EMACS_TIME sometime;
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86 /* see if there's a pending timeout. */
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87 EMACS_GET_TIME (sometime);
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88 if (tty_timer_queue &&
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89 EMACS_TIME_EQUAL_OR_GREATER (sometime, tty_timer_queue->time))
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90 return 1;
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91 }
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92
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93 return poll_fds_for_input (user_p ? tty_only_mask :
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94 non_fake_input_wait_mask);
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95 }
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96
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97 struct console *
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98 tty_find_console_from_fd (int fd)
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99 {
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100 Lisp_Object concons;
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101
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102 CONSOLE_LOOP (concons)
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103 {
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104 struct console *c;
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105
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106 c = XCONSOLE (XCAR (concons));
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107 if (CONSOLE_TTY_P (c) && CONSOLE_TTY_DATA (c)->infd == fd)
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108 return c;
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109 }
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110
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111 return 0;
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112 }
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113
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114 static void
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115 emacs_tty_next_event (struct Lisp_Event *emacs_event)
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116 {
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117 while (1)
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118 {
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119 int ndesc;
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120 int i;
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121 SELECT_TYPE temp_mask = input_wait_mask;
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122 EMACS_TIME time_to_block;
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123 EMACS_SELECT_TIME select_time_to_block, *pointer_to_this;
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124
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125 if (!get_low_level_timeout_interval (tty_timer_queue, &time_to_block))
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126 /* no timer events; block indefinitely */
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127 pointer_to_this = 0;
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128 else
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129 {
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130 EMACS_TIME_TO_SELECT_TIME (time_to_block, select_time_to_block);
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131 pointer_to_this = &select_time_to_block;
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132 }
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133
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134 ndesc = select (MAXDESC, &temp_mask, 0, 0, pointer_to_this);
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135 if (ndesc > 0)
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136 {
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137 /* Look for a TTY event */
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138 for (i = 0; i < MAXDESC; i++)
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139 {
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140 /* To avoid race conditions (among other things, an infinite
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141 loop when called from Fdiscard_input()), we must return
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142 user events ahead of process events. */
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143 if (FD_ISSET (i, &temp_mask) && FD_ISSET (i, &tty_only_mask))
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144 {
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145 struct console *c = tty_find_console_from_fd (i);
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146
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147 assert (c);
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148 if (read_event_from_tty_or_stream_desc (emacs_event, c, i))
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149 return;
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150 }
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151 }
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152
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153 /* Look for a process event */
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154 for (i = 0; i < MAXDESC; i++)
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155 {
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156 if (FD_ISSET (i, &temp_mask) && FD_ISSET (i, &process_only_mask))
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157 {
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158 Lisp_Object process;
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159 struct Lisp_Process *p =
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160 get_process_from_usid (FD_TO_USID(i));
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161
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162 assert (p);
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163 XSETPROCESS (process, p);
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164 emacs_event->event_type = process_event;
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165 /* process events have nil as channel */
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166 emacs_event->timestamp = 0; /* #### */
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167 emacs_event->event.process.process = process;
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168 return;
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169 }
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170 }
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171
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172 /* We might get here when a fake event came through a signal. */
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173 /* Return a dummy event, so that a cycle of the command loop will
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174 occur. */
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175 drain_signal_event_pipe ();
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176 emacs_event->event_type = eval_event;
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177 /* eval events have nil as channel */
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178 emacs_event->event.eval.function = Qidentity;
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179 emacs_event->event.eval.object = Qnil;
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180 return;
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181 }
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182 else if (ndesc == 0) /* timeout fired */
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183 {
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184 tty_timeout_to_emacs_event (emacs_event);
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185 return;
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186 }
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187 }
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188 }
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189
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190 static void
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191 emacs_tty_handle_magic_event (struct Lisp_Event *emacs_event)
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192 {
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193 /* Nothing to do currently */
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194 }
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195
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196
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197 static void
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198 emacs_tty_select_process (struct Lisp_Process *process)
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199 {
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200 event_stream_unixoid_select_process (process);
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201 }
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202
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203 static void
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204 emacs_tty_unselect_process (struct Lisp_Process *process)
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205 {
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206 event_stream_unixoid_unselect_process (process);
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207 }
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208
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209 static void
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210 emacs_tty_select_console (struct console *con)
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211 {
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212 event_stream_unixoid_select_console (con);
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213 }
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214
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215 static void
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216 emacs_tty_unselect_console (struct console *con)
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217 {
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218 event_stream_unixoid_unselect_console (con);
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219 }
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220
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221 static void
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222 emacs_tty_quit_p (void)
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223 {
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224 /* Nothing to do currently because QUIT is handled through SIGINT.
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225 This could change. */
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226 }
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227
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228 static USID
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229 emacs_tty_create_stream_pair (void* inhandle, void* outhandle,
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230 Lisp_Object* instream, Lisp_Object* outstream, int flags)
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231 {
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232 return event_stream_unixoid_create_stream_pair
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233 (inhandle, outhandle, instream, outstream, flags);
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234 }
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235
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236 static USID
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237 emacs_tty_delete_stream_pair (Lisp_Object instream, Lisp_Object outstream)
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238 {
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239 return event_stream_unixoid_delete_stream_pair (instream, outstream);
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240 }
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241
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242
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243 /************************************************************************/
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244 /* initialization */
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245 /************************************************************************/
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246
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247 void
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248 reinit_vars_of_event_tty (void)
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249 {
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250 tty_event_stream = xnew (struct event_stream);
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251
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252 tty_event_stream->event_pending_p = emacs_tty_event_pending_p;
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253 tty_event_stream->next_event_cb = emacs_tty_next_event;
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254 tty_event_stream->handle_magic_event_cb = emacs_tty_handle_magic_event;
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255 tty_event_stream->add_timeout_cb = emacs_tty_add_timeout;
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256 tty_event_stream->remove_timeout_cb = emacs_tty_remove_timeout;
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257 tty_event_stream->select_console_cb = emacs_tty_select_console;
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258 tty_event_stream->unselect_console_cb = emacs_tty_unselect_console;
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259 tty_event_stream->select_process_cb = emacs_tty_select_process;
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260 tty_event_stream->unselect_process_cb = emacs_tty_unselect_process;
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261 tty_event_stream->quit_p_cb = emacs_tty_quit_p;
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262 tty_event_stream->create_stream_pair_cb = emacs_tty_create_stream_pair;
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263 tty_event_stream->delete_stream_pair_cb = emacs_tty_delete_stream_pair;
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264 }
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265
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266 void
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267 vars_of_event_tty (void)
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268 {
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269 reinit_vars_of_event_tty ();
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270 }
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271
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272 void
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273 init_event_tty_late (void)
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274 {
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275 event_stream = tty_event_stream;
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276 }
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